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2020 Jan 20
2
Stale pid file problem, and a proposed solution
Today, rsyncd manages its pid file by open()ing it with O_CREAT|O_EXCL at startup, and then unlink()ing it at shutdown. If the open() fails at startup because the file already exists, then rsyncd will assume another instance of itself is already running and not start. However, there's a problem with this approach: if rsyncd is terminated without being able to clean up (e.g., kill -9, or the